1. Z. Kadivar, PT, PhD, Department of Rehabilitation Services and Child Life, Harris Health System, 3601 N MacGregor Way, Houston, TX 77004 (USA).
2. A. English, PT, DPT, Department of Rehabilitation Services, Gaylord Specialty Healthcare, Wallingford, Connecticut.
3. B.D. Marx, PhD, Department of Experimental Statistics, Louisiana State University, Baton Rouge, Louisiana.